Abstract
This paper describes a new technique of local strain measurement using heat shrinkable tubing for wet or highly imhomogeneous rocks. This technique, assuming that a specimen and the tubing are uniformly deformed, is to measure the axial and circumferential strains on tubing under deformation using ordinary strain gauges. The measured strains are converted into the strains on specimen. The validation tests under uniaxial and triaxial compression are carried out with dry and wet Tage tuff. The magnitude of confinement due to wrapping the specimen by tubing is also examined. This technique can be utilized as an easy method to simultaneously determine the elastic modulus and Poisson's ratio of wet or highly imhomogeneous rocks.
